Examine the given defective crystal : {:(X^(+),Y^(-),X^(+),Y^(-),X^(+)),(Y^(-),X^(+),Y^(-),X^(+), Y^(-)),(X^(+),Y^(-),X^(+),e^(-),X^(+)),(Y^(-),X^(+),Y^(-),X^(+),Y^(-)):} Answer the following questions : (i) Is the above defect stoichiometric or non-stoichiometric ? (ii) Write the term used for the electron occupied site. (iii) Give an example of a compound which shows this type of defect.

Examine the given defective crystal : {:(X^(+),Y^(-),X^(+),Y^(-),X^(+)

1.	Examine the given defective crystal : {:(X^(+),Y^(-),X^(+),Y^(-),X^(+)),(Y^(-),X^(+),Y^(-),X^(+), Y^(-)),(X^(+),Y^(-),X^(+),e^(-),X^(+)),(Y^(-),X^(+),Y^(-),X^(+),Y^(-)):} Answer the following questions : (i) Is the above defect stoichiometric or non-stoichiometric ? (ii) Write the term used for the electron occupied site. (iii) Give an example of a compound which shows this type of defect.
Answer» SOLUTION :(i) This DEFECT is non-stoichiometric. (ii) F-centre (III) When CRYSTALS of NaCl are heated in an atmosphere of NA vapours.